I just have a silly question...

I am thinking of buy bigger injectors. I don't have forced induction but wanted to know if that would give me any power gains.. So far I have,, cold air intake, 70mm throttle body, headers, and fully 3 inch exhaust, apexi air fuel... What do you guys think.. would a upgrade on injectors help me any.. or should I just keep the stock ones??

 

It seems that you would just be dumping more fuel into the combustion chamber. A more aggressive Spark plug or other ignition modification could more effectively combust the added fuel but I do not know if what I am saying is even right or if there are options like that for us.

The FI guys will have better info than I do

 

IMHO, unless the injector duty cycles are approaching 100% with your current setup bigger injectors are not needed. If you add bigger injectors the ECU will just dial back the injector duty cycle (the length of time the injector is 'firing') to maintain the same mixture.

I could be wrong here but that's my .02...

 

You do not need and will not benifit from larger injectors. Stockers run right around 70% duty, adding IEH you are not going to be pushing any extra fuel. In fact most NA guys buy a VAFC to remove fuel (less duty).

I'm not even going to get into the issues with putting larger injectors on a stock ECU, just know that you don't need them

 

 

But I have some 440s if you just have to do it.

 

At best you'll break even, but you take a greater chance of making things worse as the injector size grows. As the size goes up, the ability of the injectors to spray a specified amount of fuel will decrease... you may get a little more one time, a little less the next, etc. Look at it this way... if stock injectors could give you 'X' amount of fuel +/- 0.5%, a significantly larger injector may be more like +/-2%. This would make for some rough running.

You want to go with larger injectors when your current ones are approaching 100% (say, >90% ). I don't know what capacity ours are running at, but we have a surprising amount of margin when you consider we can run stock injectors with an SC using only an increased pressure pump.

Your injectors already give you the required amount of fuel... the stock ones can increase the amount of fuel they deliver, but there's no need for it. Going larger won't help...